Submitting parameters to Invoke-Expression - powershell

Question

I've written a sample Powershell Script with name C:\Script\Scrip1.ps1
Below is the code
Function Testfunction(){
Param(
$Node1,
$Node2
)
$SQLNodes = #($Node1, $Node2)
foreach ($node in $SQLNodes)
{
#Some code below is dummy code
"$node" | Out-File C:\File1.txt -Append
}
}
When i try to call this function using invoke-Expression it doesn't work
Used below method with no luck
$string = 'C:\Script\Script1.ps1 Testfunction -Node1 "test" -Node2 "test2"'
Invoke-Expression $string
I have opened a PS Window and ran below command without luck
.\Script1.ps1 -Node1 Hello -Node2 Aquib
or
.\Script1.ps1 Testfunction -Node1 Hello -Node2 Aquib
I do not see any file1 under C:\File1
when when I open the script file and then run the function, it does work and generate the file.

Answer 1

You don't need to use Invoke-Expression in your scenario.
If you want to make Testfunction visible in the current scope, you will need to "dot-source" your script:
PS C:\> . C:\Scripts\Script1.ps1
This executes Script.ps1 in the current scope, which will define Testfunction in the current scope, and then you can run the function:
PS C:\> Testfunction -Node1 "Test1" -Node2 "Test2"
Another alternative is to skip defining Testfunction as a function in a script, and just use it as a script itself:
# Script file
param(
$Node1,
$Node2
)
$SQLNodes = #($Node1, $Node2)
foreach ($node in $SQLNodes) {
#Some code below is dummy code
"$node" | Out-File C:\File1.txt -Append
}
If you name the script Testfunction.ps1, you can run it by typing the script's name:
PS C:\> C:\Scripts\Testfunction.ps1 -Node1 "Test1" -Node2 "Test2"